This map shows the possible routes taken by flight MH370 if it was moving at constant speeds of 400 knot (740km/h) and 450 knot (833km/h) respectively.

This diagram released by the Malaysian authorities shows the Doppler contributions to the burst frequency offset. British firm Inmarsat developed a new technique which analyses the speed of the aircraft relative to the satellite. Depending on this relative movement, the frequency received and transmitted will differ from its normal value, in much the same way that the sound of a passing car would seem to have changed as it approaches and passes by an observer. The burst frequency offset is the difference (due to Doppler contributions) between the expected received frequence and that actually measured.

This graph released by the Malaysian authorities shows the following: The blue line is the burst frequency offset measured at the ground station for MH370, the green line is the predicted burst frequency offset for the southern route, which over the last 6 handshakes show close correlation with the measured values for MH370. The red line is the predicted burst frequency offset for the northern route, which over the last 6 handshakes does not correlate with the measured values for MH370.

MH370: From South China Sea to southern Indian Ocean

MH370: Sequence of events

Said PM Najib: "It is therefore with deep sadness and regret that I must inform you that, according to this new data, flight MH370 ended in the southern Indian Ocean."

All 239 passengers and crew on board MH370 are feared dead after it was determined that the Malaysia Airlines Boeing 777-200 went down in the Indian Ocean.

Malaysia Airlines also sent a text message to families expressing deep regret.

Families in Beijing and Kuala Lumpur were seen wailing when they heard the news that the plane had crashed and there was no hope of any survivors.

Prime Minister Datuk Seri Najib Tun Razak announced live over TV that the flight ended in the Indian Ocean based on confirmation from investigators.

A few relatives were weak-kneed, and had to be supported by others as they tried to evade the multitude of cameras.

Acting Transport Minister Datuk Seri Hishammuddin Tun Hussein called for the privacy of the families of passengers and crew flight MH370 to be respected.

Mr Selamat Umar, whose son was on board MH370, was too stunned to speak to reporters after Malaysian PM Najib Razak's announcement on Monday. He had clung onto to the hope that the plane was hijacked and his son would eventually return.

A relative of passengers on Malaysia Airlines flight MH370 cries after hearing the news that the plane plunged into the Indian Ocean at a hotel in Beijing on March 24, 2014.

The missing Malaysia Airlines jet came down in the Indian Ocean, Prime Minister Najib Razak said March 24, as the airline reportedly told relatives it had been lost and that none on board survived.

An angry relative waves gestures with a fist after hearing the news that Malaysia Airlines flight MH370 plunged into the Indian Ocean.